Heat insulation structure of reactor pressure vessel and reactor pit water injection system

Abstract

The application discloses a heat preservation structure of a reactor pressure vessel and a reactor pit water injection system. The heat preservation structure of the reactor pressure vessel comprises a heat preservation assembly provided with a first mounting part and a second mounting part, a first supporting piece adapted to be connected with a supporting ring arranged on the periphery of a reactor pit, the first supporting piece being configured to bear the first mounting part when the heat preservation assembly extends into the reactor pit along a preset direction, and a second supporting piece adapted to be arranged in the reactor pit, the second supporting piece being configured to center the heat preservation assembly when the heat preservation assembly extends into the reactor pit along the preset direction and limit the second mounting part along the circumference of the heat preservation assembly. The heat preservation assembly, the first mounting part and the second mounting part are preassembled as a whole, and hoisting and positioning installation work are integrated in one step, thereby eliminating the side wall welding and adjustment work that may be required in the traditional method, reducing construction difficulty and construction time, improving overall construction efficiency, and shortening the installation and adjustment period in the reactor pit.

Description

Technical Field

[0001] This invention relates to the field of nuclear power equipment technology, and in particular to a thermal insulation structure for a reactor pressure vessel and a reactor pit water injection system. Background Technology

[0002] In related technologies, the thermal insulation fixing method for reactor pressure vessels is as follows: For the cylindrical section, the insulation layer is fixed by supports fixed to embedded parts in the reactor pit. The flow channel liner is connected to the lateral supports by bolts, and the lateral supports are welded to the embedded parts in the reactor pit. For the lower head section, the insulation layer is fixed by a bottom bracket. The flow channel liner is connected to the bottom bracket by bolts, and the bottom bracket is welded to the embedded plate at the bottom of the reactor pit. For the cylindrical section insulation layer support scheme, the lateral supports for the reactor pressure vessel insulation need to be welded and adjusted after the inner ring plate is embedded in the reactor pit, and finally the flow channel liner and insulation layer blocks are installed and adjusted. Due to the large number of lateral supports for the insulation layer, the high installation accuracy requirements, and the narrow operating space, the installation period for the insulation layer in the reactor pit is approximately 6 months or more.

[0003] Especially after adopting the open-top construction method, the installation of RPV (reactor pressure vessel) insulation components is on the critical path of construction, and the difficulty of risk control in terms of project progress and quality will be more prominent. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a thermal insulation structure for a reactor pressure vessel.

[0005] The present invention also proposes a reactor pit water injection system having the above-mentioned thermal insulation structure of the reactor pressure vessel.

[0006] According to a first aspect of the present invention, a thermal insulation structure for a reactor pressure vessel includes: a thermal insulation component having a thermal insulation cavity for housing the reactor pressure vessel; the thermal insulation component having a first mounting portion and a second mounting portion; a first support member adapted to connect with a support ring disposed around the periphery of the reactor pit, the first support member being configured to support the first mounting portion when the thermal insulation component extends into the reactor pit in a predetermined direction; and a second support member adapted to be disposed within the reactor pit, the second support member being configured to center the thermal insulation component when the thermal insulation component extends into the reactor pit in a predetermined direction, and to limit the second mounting portion circumferentially along the thermal insulation component.

[0007] The thermal insulation structure of the reactor pressure vessel according to embodiments of the present invention has at least the following beneficial effects: the thermal insulation component, the first mounting part, and the second mounting part are pre-assembled into a single unit; and the hoisting and positioning installation work is integrated into one step. That is, as the thermal insulation component extends into the reactor pit along a preset direction, the first mounting part automatically engages with the first support member, and the second mounting part also automatically engages with the second support member. The second support member also has a centering function, meaning that during the process of the thermal insulation component extending into the reactor pit, the second support member can ensure that the thermal insulation component is centered in the correct direction, ensuring a unique installation position for the thermal insulation component, avoiding subsequent adjustment work, and improving installation accuracy. It eliminates the sidewall welding and adjustment work that may be required in traditional methods. It can reduce construction difficulty, shorten construction time, and improve overall construction efficiency; thereby shortening the installation and adjustment period within the reactor pit.

[0008] According to some embodiments of the present invention, the bottom of the first mounting portion forms a first plane; the first support member has a bearing plane, and when the insulation component extends into the pile pit, the bearing plane contacts the first plane to support the insulation component.

[0009] According to some embodiments of the present invention, an adjusting member is further included; the first mounting portion has a threaded hole, and the adjusting member is threadedly connected to the threaded hole; the adjusting member is rotatable relative to the first mounting portion to abut against the support ring so that there is a gap between the first plane and the bearing plane.

[0010] According to some embodiments of the present invention, the first support member has a guide groove extending radially along the insulation component, and the adjusting member passes through the guide groove; when there is a gap between the first plane and the bearing plane, the first support member is capable of moving radially along the insulation component.

[0011] According to some embodiments of the present invention, in the second mounting part and the second support member, one of them forms a limiting groove extending radially along the thermal insulation component, and the other includes a limiting plate inserted into the limiting groove.

[0012] According to some embodiments of the present invention, the second mounting part is provided with a plurality of spaced limiting grooves along the circumference of the thermal insulation component; the second support member includes a plurality of limiting plates, the number of the limiting plates being the same as the number of the limiting grooves, and the limiting plates being inserted into the limiting grooves one by one.

[0013] According to some embodiments of the present invention, the second support member further includes a support base, one end of which is used to connect to the bottom wall of the pile pit, and the other end of which is provided with an annular plate; the annular plate has the limiting groove; or, the limiting plate is connected to the annular plate.

[0014] According to some embodiments of the present invention, the thermal insulation component has an installed state and an operating state. When the thermal insulation component is in the installed state, the first mounting portion is in contact with the surface of the first support member. When the thermal insulation component is in the operating state, the first mounting portion can move radially relative to the second mounting portion of the thermal insulation component to accommodate the radial thermal expansion of the thermal insulation component.

[0015] According to some embodiments of the present invention, the first support member has a mounting groove extending radially along the insulation component, a portion of the first mounting part is disposed within the mounting groove, the first mounting part is circumferentially confined between the two side walls of the mounting groove; the bottom surface of the first mounting part contacts the bottom wall of the mounting groove, and the first mounting part is capable of moving radially within the mounting groove along the insulation component to accommodate the radial thermal expansion of the insulation component.

[0016] According to some embodiments of the present invention, the first support member includes a pad and a cover plate, the pad having the mounting groove, and the cover plate being detachably connected to the pad; the cover plate having a first limiting portion located at the opening of the mounting groove, and a portion of the first mounting portion being limited between the first limiting portion and the bottom wall of the mounting groove; and / or, the cover plate having a second limiting portion located at one end of the mounting groove facing the insulation component, and when the insulation component is in the installation state, the second limiting portion stops the first mounting portion.

[0017] According to some embodiments of the present invention, the first mounting part includes a base plate and a rib plate, the rib plate connecting the top surface of the base plate and the side wall of the insulation component; the base plate is disposed in the mounting groove, and the bottom surface of the base plate contacts the bottom wall of the mounting groove.

[0018] According to some embodiments of the present invention, the second mounting part is engaged with the second support member in a slot; when the thermal insulation component is in operation, the second mounting part can move relative to the second support member along the axial direction of the thermal insulation component until the second mounting part abuts against the second support member to accommodate the axial thermal expansion of the thermal insulation component.

[0019] According to some embodiments of the present invention, the second mounting portion is disposed at the bottom of the thermal insulation component, and the second mounting portion has a limiting groove extending radially along the thermal insulation component; the second support member includes a limiting plate, the first end of the limiting plate being inserted into the limiting groove; when the thermal insulation component is in the installation state, there is a gap between the first end of the limiting plate and the bottom wall of the limiting groove; when the thermal insulation component is in the working state, the first end of the limiting plate abuts against the bottom wall of the limiting groove to support the thermal insulation component.

[0020] According to some embodiments of the present invention, the number of the first support member and the second support member are the same, and the first support member and the second support member are aligned along the axial direction of the thermal insulation component.

[0021] According to some embodiments of the present invention, the heat insulation component includes a flow guide tube and a heat insulation layer disposed on the outside of the flow guide tube, and the first mounting part and the second mounting part are both connected to the flow guide tube.

[0022] According to a second aspect of the present invention, the reactor pit water injection system includes a reactor pit, a support ring, and a thermal insulation structure for the reactor pressure vessel as described in the first aspect. The support ring is disposed on the outside of the reactor pit, the first support member is connected to the support ring, and the second support member is disposed inside the reactor pit.

[0023] The water injection system for the stack pit according to embodiments of the present invention has at least the following beneficial effects: the insulation component, the first installation part, and the second installation part are pre-assembled into a whole; the hoisting and positioning installation work is integrated into one step, eliminating the side wall welding and adjustment work that may be required in traditional methods; the construction difficulty can be reduced, the construction time can be reduced, and the overall construction efficiency can be improved; thereby shortening the installation and adjustment period in the stack pit.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 This is a schematic diagram of the water injection system in the sump pit according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle;

[0028] Figure 3 This is a schematic diagram showing the cooperation relationship between the first support member and the support ring in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram showing the positional relationship between the thermal insulation component and the supporting structure in an embodiment of the present invention;

[0030] Figure 5 for Figure 4 A magnified view of a portion of region B in the middle;

[0031] Figure 6 This is a schematic diagram of the structure of the pad in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the cover plate in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the structure of the first mounting part in an embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram illustrating the cooperation relationship between the second mounting part and the second support member in an embodiment of the present invention;

[0035] Figure 10 for Figure 9 A magnified view of a portion of region C in the middle;

[0036] Figure 11 This is a schematic diagram showing the distribution of the first mounting part and the first support base in an embodiment of the present invention.

[0037] Figure label:

[0038] 1000. Pit water injection system;

[0039] 100. Thermal insulation structure;

[0040] 10. First mounting part; 11. First plane; 12. Threaded hole; 13. Base plate; 14. Rib plate;

[0041] 20. Second mounting section; 21. Limiting groove;

[0042] 30. First support member; 31. Bearing plane; 32. Guide groove; 33. Mounting groove; 34. Pad; 35. Limiting boss; 36. Cover plate; 361. First limiting part; 362. Second limiting part;

[0043] 40. Second support component; 41. Limiting plate; 411. Horizontal plate; 412. Vertical plate; 42. Support base; 421. Support leg; 422. Adjustable support section; 423. Reinforcing rod; 43. Annular plate;

[0044] 50. Adjusting components;

[0045] 200. Thermal insulation component; 201. Flow guide tube; 202. Thermal insulation layer; 203. Thermal insulation cavity;

[0046] 300. Pile pit;

[0047] 400. Reactor pressure vessel;

[0048] 500, Support ring. Detailed Implementation

[0049] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0050] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0051] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0052] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0053] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] In a first aspect, this application provides a thermal insulation structure for a reactor pressure vessel (hereinafter referred to as the thermal insulation structure), such as Figures 1 to 3 As shown, the thermal insulation structure 100 is located inside the crater 300 and is used to install the reactor pressure vessel 400.

[0055] like Figures 1 to 3As shown, the insulation structure 100 includes an insulation component 200, a first mounting part 10, a second mounting part 20, a first support member 30, and a second support member 40. The first mounting part 10, the second mounting part 20, the first support member 30, and the second support member 40 together form a support structure for stably installing the insulation component in the pile pit 300.

[0056] The insulation assembly 200 includes a flow guide 201 and an insulation layer 202. The flow guide 201 has an insulation cavity 203 for housing the reactor pressure vessel 400. The flow guide 201 is typically designed in a cylindrical or similar shape to fit the shape of the reactor pressure vessel 400. The main function of the flow guide 201 is to guide fluids, such as coolant, around the reactor pressure vessel 400 to ensure effective heat transfer and dissipation. The material of the flow guide 201 is typically selected to withstand high temperature, high pressure, and radiation environments to ensure its long-term stable operation.

[0057] The insulation layer 202 is located on the outside of the flow guide 201. Its main function is to reduce heat loss and improve the insulation performance of the reactor pressure vessel 400. The insulation layer 202 is typically composed of multiple layers of materials, including heat insulation materials, reflective materials, and protective layers, to provide better insulation performance. The materials and thickness of the insulation layer 202 are usually selected and designed according to the reactor's operating conditions and insulation requirements.

[0058] In some embodiments, such as Figures 1 to 3 As shown, both the first mounting part 10 and the second mounting part 20 are connected to the insulation component 200. The first support member 30 is connected to the support ring 500 located around the stacking pit 300. The first support member 30 is configured to support the first mounting part 10 when the insulation component 200 extends into the stacking pit 300 in a preset direction. The second support member 40 is located inside the stacking pit 300. The second support member 40 is configured to center the insulation component 200 when the insulation component 200 extends into the stacking pit 300 in a preset direction, and to limit the second mounting part 20 along the circumference of the insulation component 200.

[0059] In this embodiment, the insulation component 200, the first mounting part 10, and the second mounting part 20 are pre-assembled as a whole, facilitating manufacturing and transportation. More importantly, they can be operated as a unit during hoisting, simplifying the installation process. This embodiment integrates hoisting and positioning installation into one step. As the insulation component 200 extends into the pile pit 300 along a preset direction, the first mounting part 10 automatically engages with the first support member 30, and the second mounting part 20 automatically engages with the second support member 40. The second support member 40 also has a centering function, ensuring that the insulation component 200 is centered in the correct direction during its insertion into the pile pit 300. This ensures a unique installation position for the insulation component 200, avoiding subsequent adjustments and improving installation accuracy. It eliminates the sidewall welding and adjustment work that may be required in traditional methods, reducing construction difficulty, shortening construction time, improving overall construction efficiency, and thus shortening the installation and adjustment period within the pile pit 300.

[0060] In some embodiments, such as Figure 3 and Figure 4 As shown, the first mounting part 10 and the second mounting part 20 are both connected to the guide tube 201 to improve the connection reliability of the first mounting part 10, the second mounting part 20 and the guide tube 201, so that the heat insulation component 200 can be stably installed on the first support member 30 and the second support member 40.

[0061] The first mounting part 10 is usually located near the upper end of the insulation component 200. The first mounting part 10 and the first support member 30 cooperate to provide longitudinal suspension support for the insulation component 200. The second mounting part 20 is usually located near the lower end of the insulation component 200. It cooperates with the second support member 40 located in the stacking pit 300 to provide bottom load-bearing support and centering function for the insulation component 200, thus forming an upper hanging and lower supporting structure.

[0062] It should be noted that when the reactor pressure vessel 400 is operating, the insulation component 200 will experience radial and axial thermal expansion due to heat. The first mounting part 10 and the first support member 30 cooperate, and the second mounting part 20 and the second support member 40 cooperate. This arrangement, while ensuring the positioning and installation of the insulation component 200, must also accommodate the radial and axial thermal expansion. For ease of description, the state of the insulation component 200 when the reactor pressure vessel 400 is not operating is defined as the installed state, and the state of the insulation component 200 when the reactor pressure vessel 400 is operating is defined as the operating state.

[0063] The following is a detailed description of the cooperation between the first mounting part 10 and the first support member 30.

[0064] like Figure 2 and Figure 4As shown, the first mounting part 10 and the first support member 30 can be in surface contact. The first mounting part 10 and the first support member 30 have a certain contact area, which can provide greater support for the insulation component 200 and ensure that the insulation component 200 remains stable under the action of gravity and other external forces.

[0065] Meanwhile, to accommodate the radial thermal expansion of the insulation component 200 during operation, the first mounting portion 10 is designed to be radially displaced relative to the first support member 30. This improves the adaptability and reliability of the insulation component 200 and also ensures the safe operation of the reactor pressure vessel 400.

[0066] Specifically, such as Figures 4 to 8 As shown, the bottom of the first mounting part 10 forms a first plane 11, and the first support member 30 has a bearing plane 31. The bearing plane 31 and the first plane 11 cooperate to achieve surface contact. While supporting the thermal insulation component 200, it can adapt to the radial thermal expansion generated by the thermal insulation component 200 in the working state.

[0067] The first plane 11 and the bearing plane 31 can be coated with a wear-resistant coating to improve the wear resistance of the contact surfaces of the first mounting part 10 and the first support member 30, effectively preventing wear caused by radial displacement of the first plane 11 and the bearing plane 31, and maintaining the flatness and stability of the contact surfaces. The wear-resistant coating material can be selected from ceramic layers, silicon carbide layers, silicon nitride layers, metal alloy layers, etc.

[0068] In other embodiments, balls may be provided on the support plane, with the first plane 11 in contact with the balls. The ball bearing can significantly reduce the frictional resistance between the first plane 11 and the bearing plane 31. The ball bearing replaces sliding friction with rolling friction, thereby reducing friction and wear and improving the durability of the first support 30.

[0069] The first mounting part 10 can be an integral structure disposed on the outside of the insulation component 200, or it can be multiple independent structures disposed at intervals along the outer periphery of the insulation component 200. This embodiment does not limit this.

[0070] The first support member 30 can be disposed in the annular structure of the support ring 500, or it can be an independent structure disposed at intervals along the outer periphery of the insulation component 200 on the top surface of the support ring 500. The first support member 30 can be a part of the support ring 500, or it can be independent of the support ring. This embodiment does not limit this.

[0071] To ensure installation accuracy, such as Figure 2 , Figure 4 and Figure 5As shown, during the step of hoisting the insulation component 200 into the reactor pit 300, the first support member 30 is not fixed to the support ring 500. The insulation component 200 is slowly lowered into the reactor pit 300 using hoisting equipment, and the second mounting portion 20 is aligned using the second support member 40 to ensure the insulation component 200 is in the correct position both horizontally and vertically. After determining the position of the insulation component 200, the first support member 30 is adaptively adjusted based on the alignment result. Specifically, this can involve fine-tuning the height, tilt angle, or horizontal position of the first support member 30 to ensure it fits tightly against the first mounting portion 10 of the insulation component 200 and provides stable support. After completing the adaptive adjustment of the first support member 30, it is fixed to the support ring 500. This prevents the insulation component 200 from shifting due to vibration or external forces during subsequent operation. The fixing method can be bolted connection, welding, or other reliable connection methods, depending on the design requirements of the reactor pressure vessel 400 and the working environment.

[0072] In some embodiments, the first mounting portion 10 has a threaded hole 12 extending vertically, and the insulation structure 100 further includes an adjusting member 50, which is threadedly connected to the threaded hole 12 of the first mounting portion 10. The adjusting member 50 is rotatable relative to the first mounting portion 10. During the adaptive adjustment of the first support member 30, the adjusting member 50 can form a temporary support for the insulation assembly 200. Specifically, by rotating the adjusting member 50, the end of the adjusting member 50 is pressed against the support ring 500 to form a temporary support, creating a gap between the first plane 11 and the bearing plane 31, thereby facilitating the removal and placement of the first support member 30 for adaptive adjustment. After the first support member 30 is adjusted, the adjusting member 50 is rotated again relative to the first support portion until there is a space between the end of the adjusting member 50 and the support ring 500; at this time, the first plane 11 contacts the bearing plane 31 to form a support.

[0073] The adjusting member 50 has an end suitable for screwing, such as a slotted, cross-shaped, or hexagonal slot. After the first support member 30 has been adjusted and the first support member 30 has been fixed to the support ring 500, the adjusting member 50 can be removed.

[0074] Based on the above embodiments, such as Figures 4 to 7As shown, the first support member 30 has a guide groove 32 extending radially along the insulation assembly 200, through which the adjusting member 50 passes. Even with a gap between the first plane 11 and the bearing plane 31, the first support member 30 can move radially along the insulation assembly 200. The guide groove 32 allows the adjusting member 50 to pass through during the movement of the first support member 30. The cooperation between the guide groove 32 and the adjusting member 50 defines the movement path of the first support member 30, preventing it from deviating from the predetermined direction during movement and improving the accuracy and stability of the installation of the first support member 30.

[0075] The guide groove 32 forms an opening on the side of the first support member 30 facing the thermal insulation component 200, thereby allowing the adjustment member 50 to enter or exit the guide groove 32 from the opening, simplifying the process of taking the first support member 30 out of the room.

[0076] In some embodiments, the first support member 30 has a mounting groove 33 extending radially along the insulation assembly 200. A portion of the first mounting part 10 is disposed within the mounting groove 33. The first mounting part 10 is capable of moving radially within the mounting groove 33 to accommodate the radial thermal expansion of the insulation assembly 200. The bottom surface of the first mounting part 10 contacts the bottom wall of the mounting groove 33, forming a stable support structure and improving the smoothness of the radial movement of the first mounting part 10 within the mounting groove 33.

[0077] A portion of the first mounting part 10 is disposed within the mounting groove 33, and the first mounting part 10 is circumferentially limited between the two side walls of the mounting groove 33; this prevents the first mounting part 10 from deviating from the predetermined radial direction during movement.

[0078] like Figures 4 to 7 As shown, the first support member 30 includes a pad 34, the pad 34 has an installation groove 33, and a guide groove 32 can be formed on the bottom wall of the installation groove 33. Both the installation groove 33 and the guide groove 32 extend radially along the insulation component 200.

[0079] The mounting groove 33 can be formed by directly slotting the top surface of the pad 34, or two limiting bosses 35 can be set on the top surface of the pad 34, with the mounting groove 33 formed between the two limiting bosses 35. Thus, the pad 34 can be temporarily supported by the adjusting member 50 to achieve the placement and removal of the pad 34. The adaptive adjustment of the first supporting member 30 mainly involves fine-tuning the bottom surface of the mounting groove 33.

[0080] The first support member 30 also includes a cover plate 36, which is detachably connected to the pad plate 34. After the first support member 30 is adaptively adjusted, it is reinstalled. When the first support member 30 is engaged with the first mounting part 10 again, the cover plate 36 and the pad plate 34 are assembled to limit the position of the first mounting part 10.

[0081] The cover plate 36 may have a first limiting part 361, which is located at the opening of the mounting groove 33. Part of the first mounting part 10 is limited between the first limiting part 361 and the bottom wall of the mounting groove 33, thereby limiting the axial movement of the first mounting part 10. The first mounting part 10 can prevent the thermal insulation component 200 from axially jumping in a vibration environment.

[0082] When the insulation component 200 is in the installed state, the first mounting part 10 rests on the bottom wall of the mounting groove 33, and there may be a certain gap between the first mounting part 10 and the first limiting part 361. When the insulation component 200 is in the working state, the first mounting part 10 can move to abut against the first limiting part 361 due to the axial thermal expansion.

[0083] The cover plate 36 has a second limiting portion 362, which is located at the end of the mounting groove 33 facing the insulation assembly 200. After adaptively adjusting the first support member 30, the pad 34 is inserted through the gap between the first mounting portion 10 and the support ring 500, and then the cover plate 36 is assembled onto the pad 34, so that the second limiting portion 362 stops the first mounting portion 10, thereby determining the installation position of the pad 34. When the insulation assembly 200 is in the installed state, the second limiting portion 362 stops the first mounting portion 10 to prevent the insulation assembly 200 from shaking. When the insulation assembly 200 is in the working state, the first mounting portion 10 can move in the direction of increasing diameter to accommodate radial thermal expansion.

[0084] The cover plate 36 is L-shaped. The first edge of the L-shaped cover plate 36 is detachably connected to the limiting protrusion by fasteners such as bolts. The first edge of the L-shaped cover plate 36 protrudes from the limiting protrusion toward the mounting groove 33 to form a first limiting part 361. The second edge forms a second limiting part 362, which is at least partially located at the end of the mounting groove 33 toward the insulation component 200.

[0085] Mounting holes are provided on the portion of the pad 34 located on the opposite sides of the two limiting protrusions, so that the portion of the pad 34 used for the connection of the support ring 500 is fully exposed on the cover plate 36, avoiding obstruction and facilitating the locking and fixing of the pad 34 and the support ring by bolts or other fasteners.

[0086] In some embodiments, such as Figure 4 , Figure 5 and Figure 8As shown, the first mounting part 10 includes a base plate 13 and a rib plate 14. The base plate 13 is connected to the side wall of the insulation component 200, and the rib plate 14 connects the top surface of the base plate 13 and the side wall of the insulation component 200. A certain gap can be formed between the base plate 13 and the outer side of the insulation component 200. The base plate 13 is disposed in the mounting groove 33, and the bottom surface of the base plate 13 forms a first plane 11 that contacts the bottom wall of the mounting groove 33. The end of the base plate 13 near the insulation component 200 is used to contact and limit the second limiting part 362.

[0087] Both sides of the base plate 13 have portions exposed on the rib plate 14. The first limiting part 361 cooperates with the bottom wall of the mounting groove 33 to limit the portion of the base plate 13 exposed on the old rib plate 14.

[0088] The number of ribs 14 can be two, three, or even more, thereby improving the connection strength between the base plate 13, the ribs 14, and the insulation component 200. When there are two ribs 14, the base plate 13 is provided with threaded holes 12, which are located between the two ribs 14. This allows the force to be distributed when the adjusting bolts provide temporary support, preventing the ribs 14 or the base plate 13 from bending or deforming.

[0089] The following is a detailed description of the cooperation between the second mounting part 20 and the second support member 40.

[0090] like Figure 4 , Figure 9 and Figure 10 As shown, the second mounting part 20 and the second support member 40 are engaged in a slotted fit. Specifically, one of the second mounting part 20 and the second support member 40 has a limiting groove 21 extending radially along the insulation component 200, and the other includes a limiting plate 41. When the insulation component 200 is hoisted into the storage pit 300, the limiting plate 41 is simply aligned and inserted into the limiting groove 21. The rapid centering of the insulation component 200, combined with the tight fit between the limiting groove 21 and the limiting plate 41, effectively restricts the circumferential movement of the insulation component 200. Because of the simultaneous existence of centering and circumferential limiting, the insulation component 200 cannot move horizontally; it can only expand in the direction of increasing diameter when the insulation component 200 is in operation.

[0091] For example, the second mounting part 20 has a plurality of spaced limiting grooves 21 arranged around the circumference of the insulation component 200; the second support member 40 includes a plurality of limiting plates 41, the number of limiting plates 41 being the same as the number of limiting grooves 21, and the limiting plates 41 are inserted into the limiting grooves 21 one by one.

[0092] When hoisting the insulation component 200 into the pile pit 300, the limiting plate 41 on the second support 40 needs to be aligned with the limiting groove 21 on the second mounting part 20, and the limiting plate 41 should be inserted into the limiting groove 21 at the same time to avoid jamming or misalignment.

[0093] Since the limiting grooves 21 and the limiting plates 41 are distributed in the circumferential direction, the insulation component 200 will be firmly fixed to the second support 40 and kept in a centered state after all the limiting plates 41 are inserted into the limiting grooves 21. This not only prevents the insulation component 200 from moving in the horizontal direction, but also accommodates the radial thermal expansion of the insulation component 200 in the working state.

[0094] In other embodiments, a limiting plate 41 may be provided in the second mounting part 20 and a limiting groove 21 may be provided in the second support member 40. This embodiment does not limit this.

[0095] The following description uses the example of the second mounting part 20 having a limiting groove 21 and the second support member 40 having a limiting plate 41.

[0096] like Figure 4 , Figure 9 and Figure 10 As shown, the second support member 40 also includes a support base 42. One end of the support base 42 is used to connect to the bottom wall of the storage pit 300, and the other end of the support base 42 is provided with an annular plate 43. A limiting plate 41 is connected to the annular plate 43. The annular plate 43 is designed in a circular shape to adapt to the shape and size of the insulation component 200. This design ensures that the annular plate 43 can match the outer contour of the insulation component 200, providing a stable foundation for the installation of the limiting plate 41. The limiting plate 41 is connected to the annular plate 43 by welding, bolting, or other reliable connection methods. The support base 42 raises the annular plate 43 and the limiting plate 41 as a whole, suitable for the limiting plate 41 to cooperate with the limiting groove 21 of the first mounting part 10. This avoids the axial dimension of the limiting plate 41 being too large, which would affect the structural strength of the limiting plate 41, and ensures that the limiting plate 41 has sufficient strength and rigidity to withstand the weight and pressure of the insulation component 200.

[0097] The support base 42 may include multiple legs 421, one end of each leg 421 being connected to an adjustable support section 422 and the other end being connected to an annular plate 43. The adjustable support end may be connected to an embedded plate pre-embedded in the bottom of the storage pit 300, or it may be fixed to the bottom of the storage pit 300 by expansion bolts; this application does not limit this. The support base 42 also includes a reinforcing rod 423 connecting two adjacent legs 421 to improve the overall strength of the support base 42.

[0098] Shims of varying thicknesses can be installed between the outrigger 421 and the adjustable support section 422 to precisely adjust the level of the annular plate 43. This design ensures that the annular plate 43 remains level throughout the installation process, preventing installation problems caused by tilting or unevenness.

[0099] To accommodate the axial thermal expansion of the insulation component 200 when it is in operation, the second mounting part 20 can move relative to the second support member 40 along the axial direction of the insulation component 200 until it abuts against the second support member 40. That is, when the insulation component 200 is in the mounting state, the first mounting part 10 and the first support member 30 cooperate to support the insulation component 200, while the second mounting part 20 and the second support member 40 only provide circumferential limiting and centering functions. When the insulation component 200 is in operation, as its axial thermal expansion increases, initially, it is supported by the cooperation of the first mounting part 10 and the first support member 30, while the second mounting part 20 moves closer to the second support member 40. At a critical point, the first mounting part 10 and the first support member 30 cooperate, and the second mounting part 20 and the second support member 40 cooperate to provide support. Subsequently, the second mounting part 20 and the second support member 40 cooperate to provide support, and the first mounting part 10 moves away from the bearing plane 31 until it abuts against the first limiting part 361. Between the installed state and the operating state, the support structure realizes the transition from the first mounting part 10 and the first support member 30 to the second mounting part 20 and the second support member 40. This transition ensures that the insulation component 200 receives appropriate support and fixation in different states.

[0100] Furthermore, in the event of an earthquake, an accident, or failure of the cooperation between the first mounting part 10 and the first support member 30, the second mounting part 20 and the second support member 40 can cooperate to provide support and ensure safe operation.

[0101] like Figure 10 As shown, the limiting plate 41 can be a T-shaped structure, that is, the limiting plate 41 includes a horizontal plate 411 and a vertical plate 412 connected vertically. The horizontal plate 411 is connected to the annular plate 43, and the vertical plate 412 is used to extend into the limiting groove 21. When the insulation component 200 is in the installed state, there is a gap between the end of the vertical plate 412 away from the horizontal plate 411 and the bottom wall of the limiting groove 21; when the insulation component 200 is in the working state, the end of the vertical plate 412 away from the horizontal plate 411 can contact or abut against the bottom wall of the limiting groove 21.

[0102] In other embodiments, when the insulation component 200 is in the installed state, the gap between the end of the vertical plate 412 away from the horizontal plate 411 and the limiting groove 21 is greater than the distance between the bottom of the second limiting part 362 and the horizontal plate 411. Therefore, when the insulation component 200 is in the working state, the bottom of the second limiting part 362 can contact or abut against the horizontal plate 411. This embodiment does not limit this.

[0103] The second mounting part 20 is located at the bottom of the insulation component 200. The second mounting part 20 has a limiting groove 21 extending radially along the insulation component 200. The second support member 40 includes a limiting plate 41, the first end of which is inserted into the limiting groove 21. When the insulation component 200 is in the installation state, there is a gap between the first end of the limiting plate 41 and the bottom wall of the limiting groove 21. When the insulation component 200 is in the working state, the first end of the limiting plate 41 abuts against the bottom wall of the limiting groove 21 to support the insulation component 200.

[0104] like Figure 1 and Figure 11 As shown, the first mounting part 10 and the first support member 30 together form multiple support points in the circumferential direction of the insulation component 200. These support points ensure that the insulation component 200 is subjected to uniform force in the circumferential direction, avoiding deformation or damage caused by excessive force at a single point. To avoid interference with structures such as the RPV (Reactor Pressure Vessel 400) support, RPV inlet / outlet pipes, and DVI (Direct Vessel Injection) pipes, the support points formed by the first mounting part 10 and the first support member 30 are arranged in the gap between any two adjacent structures in these structures. This layout not only ensures the effectiveness of the support points but also avoids installation difficulties or operational failures caused by interference.

[0105] There are multiple first support members 30, which are spaced apart circumferentially along the insulation component 200. This distribution ensures that the insulation component 200 receives uniform support in the circumferential direction, improving its overall rigidity and stability. Figure 11 As shown, the first mounting part 10 and the first support member 30 form six support points, and these six support points are evenly spaced along the axial direction of the insulation component 200. The number of second support members 40 is the same as that of the first support members 30, and they are aligned along the axial direction of the insulation component 200. This means that each first support member 30 has a corresponding second support member 40 in the axial direction, together forming a three-dimensional support network for the insulation component 200. This alignment helps maintain the stability and consistency of the insulation component 200 in the axial direction.

[0106] Secondly, the present invention also provides a water injection system for sump pits, in some embodiments, such as Figure 1 As shown, the reactor crater water injection system 1000 includes a reactor crater 300, a support ring 500, and the aforementioned thermal insulation structure of the reactor pressure vessel. The support ring 500 is located on the outside of the reactor crater 300, a first support member 30 is connected to the support ring 500, and a second support member 40 is located inside the reactor crater 300. The reactor crater water injection system 1000 of this invention has the same technical effects as the thermal insulation structure 100 in the above embodiments, and will not be described again here.

[0107] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A thermal insulation structure for a reactor pressure vessel, characterized in that, include: Insulation assembly, having an insulation cavity for housing a reactor pressure vessel; The thermal insulation component is provided with a first mounting part and a second mounting part; A first support member is adapted to connect with a support ring disposed around the periphery of the stack pit. The first support member is configured to support the first mounting portion when the insulation component extends into the stack pit in a preset direction. The second support member is adapted to be disposed in the pile pit. The second support member is configured to center the insulation component when the insulation component extends into the pile pit in a preset direction, and to limit the second mounting part along the circumferential direction of the insulation component. The first support member has a mounting groove extending in the radial direction of the thermal insulation component, and a portion of the first mounting part is disposed within the mounting groove; The first support member includes a pad and a cover plate. The pad has the mounting groove, and the cover plate is detachably connected to the pad. The cover plate has a first limiting part, which is located at the opening of the mounting groove, and a portion of the first mounting part is limited between the first limiting part and the bottom wall of the mounting groove. The second mounting part is located at the bottom of the insulation component. The second mounting part has a limiting groove extending radially along the insulation component. The second support member includes a limiting plate, and the first end of the limiting plate is inserted into the limiting groove. When the insulation component is in the installation state, there is a gap between the first end of the limiting plate and the bottom wall of the limiting groove, the first mounting part is supported by the bottom wall of the mounting groove, and there is a gap between the first mounting part and the first limiting part. When the insulation component is in operation, the first end of the limiting plate abuts against the bottom wall of the limiting groove to support the insulation component, and the first mounting part moves axially to abut against the first limiting part.

2. The thermal insulation structure of the reactor pressure vessel according to claim 1, characterized in that, The bottom of the first mounting part forms a first plane; The first support member has a bearing plane, which contacts the first plane to support the insulation component when the insulation component extends into the pile pit.

3. The thermal insulation structure of the reactor pressure vessel according to claim 2, characterized in that, It also includes adjustment components; The first mounting part has a threaded hole, and the adjusting member is threadedly connected to the threaded hole; the adjusting member can rotate relative to the first mounting part to press against the support ring so that there is a gap between the first plane and the bearing plane.

4. The thermal insulation structure of the reactor pressure vessel according to claim 3, characterized in that, The first support member has a guide groove extending radially along the insulation assembly, through which the adjusting member passes; When there is a gap between the first plane and the bearing plane, the first support member can move radially along the insulation component.

5. The thermal insulation structure of the reactor pressure vessel according to claim 1, characterized in that, In the second mounting part and the second support member, one of them forms a limiting groove extending radially along the insulation component, and the other includes a limiting plate inserted into the limiting groove.

6. The thermal insulation structure of the reactor pressure vessel according to claim 5, characterized in that, The second mounting part has a plurality of spaced limiting grooves arranged along the circumference of the thermal insulation component; The second support member includes multiple limiting plates, the number of which is the same as the number of limiting slots, and the limiting plates are inserted into the limiting slots one by one.

7. The thermal insulation structure of the reactor pressure vessel according to claim 5, characterized in that, The second support also includes a support base, one end of which is used to connect to the bottom wall of the pit, and the other end of which is provided with an annular plate; The annular plate has the limiting groove; or, the limiting plate is connected to the annular plate.

8. The thermal insulation structure of the reactor pressure vessel according to any one of claims 1 to 7, characterized in that, The thermal insulation component has an installed state and a working state. When the thermal insulation component is in the installed state, the first mounting part is in contact with the surface of the first support member. When the thermal insulation component is in operation, the first mounting part can move radially relative to the second mounting part along the thermal insulation component to accommodate the radial thermal expansion of the thermal insulation component.

9. The thermal insulation structure of the reactor pressure vessel according to claim 8, characterized in that, The first mounting part is circumferentially located between the two side walls of the mounting groove; The bottom surface of the first mounting part contacts the bottom wall of the mounting groove, and the first mounting part can move radially within the mounting groove along the insulation component to accommodate the radial thermal expansion of the insulation component.

10. The thermal insulation structure of the reactor pressure vessel according to claim 9, characterized in that, The cover plate has a second limiting part, which is located at one end of the mounting groove facing the insulation component. When the insulation component is in the installation state, the second limiting part stops the first mounting part.

11. The thermal insulation structure of the reactor pressure vessel according to claim 9, characterized in that, The first mounting part includes a base plate and a rib plate, the rib plate connecting the top surface of the base plate and the side wall of the insulation component; the base plate is disposed in the mounting groove, and the bottom surface of the base plate is in contact with the bottom wall of the mounting groove.

12. The thermal insulation structure of the reactor pressure vessel according to any one of claims 1 to 7, characterized in that, The second mounting part engages with the second support member in a slot; when the insulation component is in operation, the second mounting part can move relative to the second support member along the axial direction of the insulation component until the second mounting part abuts against the second support member to accommodate the axial thermal expansion of the insulation component.

13. The thermal insulation structure of the reactor pressure vessel according to any one of claims 1 to 7, characterized in that, The number of the first support member and the second support member are the same, and the first support member and the second support member are aligned along the axial direction of the insulation component.

14. The thermal insulation structure of the reactor pressure vessel according to any one of claims 1 to 7, characterized in that, The heat insulation component includes a flow guide tube and a heat insulation layer disposed on the outside of the flow guide tube, and both the first mounting part and the second mounting part are connected to the flow guide tube.

15. A water injection system for a sump pit, characterized in that, The reactor includes a crater, a support ring, and a thermal insulation structure for a reactor pressure vessel as described in any one of claims 1 to 14, wherein the support ring is located on the outside of the crater, the first support member is connected to the support ring, and the second support member is located inside the crater.

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